Nematodes:Eggs Infective for Humans Mouth Intestine Mouth Ovary Genital pore Anus -Intestine Testis Egg 155um Genital Spicules long) pore Anus Larva Male (2-5 mm long) Female (a)Adult pinworms (8-13 mm long) (b)Pinworm egg Figure 12.29Nematodes: Eggs Infective for Humans Figure 12.29